Chandogya Upanishad is one of the oldest Upanishad written on the Vedic Brahmana period about ninth to eighth century BC. Chandogya Upanishad is associated with Sama Veda. It is ranked ninth in the Muktika canon of hundred and eight Upanishadas. The 11th Khanda of Chapter Seven of Chandogya Upanishad states about the Self in dreamless sleep. Prajapati told Lord Indra that when is sleeping or at rest his senses are withdrawn and serene. He then sees no dream. This is the real Self. This is immortal and fearless. This is the Brahman. On hearing him Lord Indra was satisfied and returned back but before he reached the gods he thought that the Self then does not know itself that I am this nor does it know these elements i.e. as they are. They seem to be altogether destroyed for the time. He thus, could not agree with the doctrine hence he returned back to Prajapati with fuel in hand to question him. On hearing him, Prajapati asked him to stay with him as he would further explain about the Self. Hence Indra stayed with Prajapati for one hundred and one years. Therefore, it is said that that Indra lived with Prajapati as a brahmacharya one hundred and one years.
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